package _collections._map;

import java.util.*;

//集合的嵌套
public class Treemapp {
    public static void main(String[] args) {
        Map<String, List<String>> a = new HashMap<>();
        List<String> b = new ArrayList<>();
        Collections.addAll(b,"岳阳","长沙","娄底");
        a.put("湖南省",b);
        a.put("湖南",a.get(+1));

        System.out.println(a);
    }
}
